Self-cleaning drill.



R. BINNIB.

SELF CLEANING DRILL.

APPLICATION FILED JAN. 27, 1913.

Patented Dec. 16, 1913.

HNVENTOH FEG.3

tiran arianne nanna`q` ernia@ RBERT BINNIE, 0F BOLEVAR, PENNSYLVANM SELF-CLEANING DRILL.

Application led January 27, 1913. Serial No. 744,463.

ting edges of the drill bit to carry away the mud, dirt and chips formed thereby, thereby increasing the capacity and eectivenessof the drill and decreasing the time of the drilling operation.

The invention comprises the construction and arrangement of parts hereinafter deu scribed and claimed.

ln the drawings Figure 1 represents a sectional elevation of drilling apparatus embodying one form of the invention; Fig. 2 is a horizontal section of the same on the line 2-r-2, Fig. 1; and Fig. 3 isa sectional elevation illustrating a modification.

The drilling apparatus shown in the drawings comprises a .tubular drill rod l, which is hollow to provide a longitudinal passage 2 therein, and preferably is formed in one or a plurality of sections detachably secured to each other, as at 3, to suit the de th of the hole being drilled. At its lower end the drill rod is internally threaded, as at 4, to receive the threaded reduced end or tang 5 of a drill bit-6. The drill bit may be' of any desired type and is provided with a point having the usual cutting edges 7, and is preferably also provided with a uted shank, as shown in Fig. 3, having one or more channels 8 therein.' The drill bit 6 is provided with a longitudinal bore 9, which at one end communicates with the passage 2 in the drill rod 1, and which may xtend for vthe full length of the drill bit, but preferably for only a short distance at its upper end. As shown, passage 9 communicates with one or more lateral ports or passages 10 which lead outwardly to the channels 8.

The drill bit 6 is surrounded by a tubular shield 11, the lower end of which ie slightly liared, as at 12, and extends down fairly close to the cutting edges 7. This shield has a loose fit on the shank 6 and at its upper end extends above the lateral ports or pes- Specileation of )Letters Patent.

,to seat in either Patentedee. d6, 1913.

sages 10. It is rigidly held in adjusted position by any suitable means, such as a set screw 13 therein which bears at its inner end against the shank 6 or drill rod 1, but preferably by a collar 14 loosely slidable on the outside of the drill rod and secured thereto in adjusted position by a set screw 15.

Within the passage 2 in the drill rod 1 is located a suitable non-'return check valve 'of any preferred tyie. 'lhis may be arranged irection, that is, either up.-

waid'ly o1' downwardly. In the' form shown in Fig. 1, the drill rod-tube 1 is provided With a transverse wall having a port 16 therein, and surrounded b'y a valve seat 17, against which seats a ball-.valve member 18. Said ball is held in the tube by any suitable means, such as the cross in 19 and, 'if desired, ma be normally held yieldingly to its seat by a ight spring 20, although this is not essential and may be omitted. ln the formi shown in Fig. 3, the ball valve 18a seatsv `downwardly by gravity alone and no spring is necessar Any suitable means may be provided for IeClprOcatlng the drillZ such as a motor driven by steam, electricity, or compresse air, or the drill rod vma be reciprocated by one end is attached to a movable member, such as a walking beam (not shown), and at its other end is secured to an eye member 22 having a shank threaded into the internally threaded end of the drill rod 1. The upper end of the drill rod is provided with one or more lateral ports 23, communicating fwith the passage 2, and throu hwhich the liquid is supplied to the dril. As illus trated in Fig. l, the liquid is admitted to the hollow drill rod from a supply tank or vessel 24, shown as' a sleeve or jacket, and which is of such size and so arranged as to hold a sucient quantity of liquid for the. drllling operation. The u per portion of the vessel is flared outwar ly, as at 25,.s0 that it can be easily filled with liquid, and the outwardly flared portion rests upon one or more supports 26 around the hole. These may be either integral with the vessel 24 or merely separate blocks placed under the outwardly flared portion 25. The main body. portion of the vessel 24: is in the form of a tube or cylinder 27, which internally is of larger diameter than the external diameter of the drill rod, and externally is of smaller diameter than the hole. At its extreme lower end tube 24 is bent or turned inwardly to form an internal flange 28. The rodmay .be sudati@ in the Sieeve, zin which case a stuliing-boX or other suitable means may be provided at the'lowerv end of the sleeve for securing a liquid-tight .seal between the sleeve and rod. 1f. desired, however, the sleeve or jacket may be rigidly secured to the 2, rod to move therewith, as by welding the flange 28 to the rod 7at the proper location,

such arrangement being particularly desirreciprocated to cause the cutting edges 7 to impinge on the bottom of the hole and deepen the same. Liquid flows from thefvess'el 24 through the ports 23 and into the space or passage 2 within the drill rod and thence downwardly to the`- check valve. At each upward `movement of the drill rod the pressure of the water is sufficient to slightly open the check valve and permit a quantity of water to flow therethrough, the check valve automatically closing as the drill rod begins to move downwardly. The water which passes they check vvalve flows through passage 9 and lateral' ports'O in the shank of the ,drill bit and then downwardly alon the channels 8 in the fluted shank -thereo and within 'the shield 11 until it reaches the cutting edges of the drill. A continuous supply of fresh water is consequently delivered to the cutting edges of the drill during the drillingoperation. The

- water then flows upwardly laway from the cutting ledges of the drill along the4 outside of the shield 11 and sleeve 24 andl out at the top of thehole, carrying with it the mud, dirt, and chips formed by the drilling operation. In this manner all the energy of the drill is expended in the cutting operation, thus permitting an extended drilling yoperation to be carried on without pulling the drill' rod out of the hole and cleaning the latter in the ordinary manner. If desired, and especially when the hole is of the continuous supply of freshwater to thesome depth, the drilling operation can be carried on for a period of time and the drill rod and drill then removed and the hole cleaned out. Under such circumstances cuttingI edgesofy the drill very quickly frees the bottom 'of the hole of mud and dirt and secures greater eiiiciency of the drill. The

` drilling. perati'on can also'fbe carried on for a long time'without cleaning out the hole. It will of coursebe understood that as the drilling operation progresses additional segments or sections 'are added to the drill rod of liquid, such as water, is introduced, into the sleeve orjaclret 24through the open .upper end thereof. The drill rodjis lthen ,rectly into down around the outside of the drill to the 1. -The tube 24 may of course be made of any length desired, but preferably is of greater length than the several sections of the drill rodso that a new'section thereof can be addedbefore ports 23 pass beyond the lower end of the sleeve as the drill sinks int-o the hole.

For drilling in hard rock I prefer to use ,the arrangement shown in Fig. 3, which in some respects is a reversal in operation of the form shown in Fig. 1. The upper end of the drill rod 1 shown in Fig.'3 is threaded to receive the threaded nozzle 30 of a fitting 31. rIhe latter is provided with a shank or tang 32 which is adapted to be secured to the operating motor, or to which the suspending rope or cable may be attached. Fitting 31-is provided with a longitudinal pas-v sage 33 communicating with the passage 2 in drill rod 1, and with a transverse passage 34 open to the' atmosphere at both ends through tubular extensions 35. This form of device 'is also provided with a shield 11, as in the form shown in Fig. 1, and as ab'ove vstated, the ball valve 1Sa seats downwardly instead of upwardly. With this form o f device the supply of water is introduced dithe hole being bored and Hows cutting edges of the bit. At each downward movement of the drill the pressure of the "water upwardly against the check valve 18 unseats the latter and permits water and ymud to flow upwardly along the channels 8 in the drill and inside of the shield 11, :thence throughports 10 and past passage 9 and the check valve 18a. It then flows through the passage 2 in the drill rod and W is discharged Afrom the ends of the tubular extensions 35 into a suitable pan lor vessel 36. When the drill is operated by hand the extensions 35 can be used as handles.

The apparatus described is simple and can be readily manufactured and greatly lincreases the capacity of the ordinary drill. It rapidly conducts the dirt, mud, and chips away from the drill point and thus decreases the retai'ding effect of the thick mud usually.-

formed by the drill.

1'. vA rock drill, comprising a hollow shank, a hollowbit secured thereto and pro! vided with a transverse passage therethrough, saidbit having a longitudinally ex- -tending channel communica with said transverse passage, and a tubular ing at one end shield surrounding said bit, whereby when the drill is reciprocated liquidl will flow;

through said hollow shank and bit and along said channel-between said shield and bit.

A rock drill, comprising a hollow drill rod, a drill bit secured'thereto and provided with a passage communicating with the pas-- izo sage in said drill rod, a shield surrounding `said drill' bit, and a non-return check valve in one of said passages arranged to permit the iow of liquid in one direction only through said passages and within said shield as the drill rod is reciprocated.

3. A rock drill, comprising a hollow drill rod, a drill bit secured to said drill rod, a tubular shield surrounding said drill bit, said drill being luted to provide a longitudinal channel and having a passage communicating at one end with said channel and at the other, end with the passage in said drill rod, and a non-return check valve in one of said passages arranged to permit the flow of liquid in one direction only therethrough.

4. A rock drill, comprising a hollow drill rod, a drill bit secured thereto and provided with a passage therethrough communicating with the passage in said drill rod, a shield surrounding said drill bit, and a non-return check valve in one of' said passages arranged to seat upwardly and to permit the flow Of liquid downwardly through said passages and between the shield and drill bit to the cutting edges of the bit.

5. A rock drill, comprising a hollow drill SBB rod, a luted drill bit secured thereto and provided with a passage therethrough for conducting liquid to the drill point, a shield surrounding said drill bit, and a jacket surrounding the upper portion of the drill rod .and arranged to supply liquid to the. passage therein.

6. A rock drill, comprising a hollow drill rod, a drill bit secured thereto and provided witha passage therethrough arranged to conduct liquid to the drill point, a check valve in one of said passages arranged to seat upwardly, and a tube surrounding the upper portion of the drill rod and in which the same is slid'able, said drill rod being arranged to permit the supply of liquid to the passage therein from the space within said tube.

In testimony whereof, l have hereunto set my hand.

ROBERT BINNIE.

Witnesses:

LOVE JOHNSTON, R. A. JOHNSTON. 

